[PMC] Migrated some constant strings to Parrot-style constants to reduce STRING header churn.  This improves performance a slight amount.
[PMC] Migrated some constant strings to Parrot-style constants to reduce STRING
header churn.  This improves performance a slight amount.

ungrim97/rakudo,tony-o/rakudo,ab5tract/rakudo,nbrown/rakudo,tony-o/deb-rakudodaily,cognominal/rakudo,paultcochrane/rakudo,ugexe/rakudo,Leont/rakudo,teodozjan/rakudo,nbrown/rakudo,tony-o/deb-rakudodaily,lucasbuchala/rakudo,rakudo/rakudo,cygx/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,tbrowder/rakudo,Leont/rakudo,rjbs/rakudo,salortiz/rakudo,usev6/rakudo,tony-o/rakudo,paultcochrane/rakudo,ungrim97/rakudo,tony-o/deb-rakudodaily,cognominal/rakudo,teodozjan/rakudo,MasterDuke17/rakudo,dankogai/rakudo,ab5tract/rakudo,tbrowder/rakudo,teodozjan/rakudo,labster/rakudo,lucasbuchala/rakudo,sergot/rakudo,salortiz/rakudo,awwaiid/rakudo,labster/rakudo,dwarring/rakudo,zhuomingliang/rakudo,tbrowder/rakudo,b2gills/rakudo,skids/rakudo,MasterDuke17/rakudo,softmoth/rakudo,samcv/rakudo,labster/rakudo,ab5tract/rakudo,usev6/rakudo,laben/rakudo,cognominal/rakudo,salortiz/rakudo,laben/rakudo,ungrim97/rakudo,zhuomingliang/rakudo,jonathanstowe/rakudo,tony-o/rakudo,nbrown/rakudo,retupmoca/rakudo,rakudo/rakudo,ab5tract/rakudo,zhuomingliang/rakudo,raydiak/rakudo,samcv/rakudo,dwarring/rakudo,skids/rakudo,labster/rakudo,awwaiid/rakudo,dankogai/rakudo,teodozjan/rakudo,Gnouc/rakudo,tbrowder/rakudo,cygx/rakudo,ab5tract/rakudo,tony-o/rakudo,raydiak/rakudo,awwaiid/rakudo,dwarring/rakudo,rjbs/rakudo,sjn/rakudo,salortiz/rakudo,Gnouc/rakudo,raydiak/rakudo,skids/rakudo,b2gills/rakudo,niner/rakudo,nunorc/rakudo,pmurias/rakudo,paultcochrane/rakudo,sergot/rakudo,sergot/rakudo,ungrim97/rakudo,tony-o/deb-rakudodaily,b2gills/rakudo,lucasbuchala/rakudo,LLFourn/rakudo,lucasbuchala/rakudo,dankogai/rakudo,rakudo/rakudo,laben/rakudo,paultcochrane/rakudo,samcv/rakudo,cygx/rakudo,nbrown/rakudo,skids/rakudo,tony-o/deb-rakudodaily,samcv/rakudo,nunorc/rakudo,usev6/rakudo,pmurias/rakudo,Gnouc/rakudo,sergot/rakudo,tbrowder/rakudo,b2gills/rakudo,ugexe/rakudo,LLFourn/rakudo,skids/rakudo,sjn/rakudo,b2gills/rakudo,sjn/rakudo,azawawi/rakudo,rakudo/rakudo,MasterDuke17/rakudo,pmurias/rakudo,azawawi/rakudo,awwaiid/rakudo,MasterDuke17/rakudo,raydiak/rakudo,tony-o/rakudo,azawawi/rakudo,cognominal/rakudo,usev6/rakudo,sjn/rakudo,ugexe/rakudo,nbrown/rakudo,jonathanstowe/rakudo,jonathanstowe/rakudo,niner/rakudo,labster/rakudo,cognominal/rakudo,MasterDuke17/rakudo,Leont/rakudo,dwarring/rakudo,rakudo/rakudo,salortiz/rakudo,nunorc/rakudo,zostay/rakudo,zostay/rakudo,nunorc/rakudo,sjn/rakudo,rjbs/rakudo,rakudo/rakudo,usev6/rakudo,ugexe/rakudo,Gnouc/rakudo,softmoth/rakudo,Gnouc/rakudo,azawawi/rakudo,cygx/rakudo,retupmoca/rakudo,samcv/rakudo,retupmoca/rakudo,dankogai/rakudo,Leont/rakudo,tony-o/deb-rakudodaily,LLFourn/rakudo,tony-o/rakudo,azawawi/rakudo,LLFourn/rakudo,nbrown/rakudo,awwaiid/rakudo,LLFourn/rakudo,cygx/rakudo,pmurias/rakudo,tony-o/deb-rakudodaily,niner/rakudo,softmoth/rakudo,retupmoca/rakudo,niner/rakudo,softmoth/rakudo,ungrim97/rakudo,labster/rakudo,zostay/rakudo,laben/rakudo,salortiz/rakudo,softmoth/rakudo,dankogai/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,ugexe/rakudo,zhuomingliang/rakudo,lucasbuchala/rakudo,zostay/rakudo,paultcochrane/rakudo,tbrowder/rakudo